Bertha is a large lady and a former opera singer. She is a contractor that is able to control the resonance of sound. By resonating a frequency that is the inverse of a target's resonance frequency, she can destroy a target.     This can also cause other body problems, such as a heart attack, by matching the hearts resonance frequency.    Bertha's remuneration is to place something in her mouth and then vomit it out; for example, she is shown paying by eating a handful of cigarettes and then spitting them up. Its does not have to be cigarettes but she recounts her past to Itzhak about how she had a baby, who unfortunately choked to death while ingesting one of Bertha's dropped cigarettes.     (wiki)      Other Info:      ~!  Importance: Minor  Status: Dead  Episode(s): 13  !~

In Tokyo, an impenetrable field known as "Hell's Gate" appeared ten years ago. At the same time, psychics who wield paranormal powers at the cost of their conscience also emerged. Hei is one of the most powerful of these psychic agents, and along with his blind associate, Yin, works for one of the many rival agencies vying to unlock the mysteries of Hell's Gate.
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(Source: Anime News Network)

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